吉安大桥防雷设计与施工

吉安大桥横跨赣江两岸,是一座钢拱形索拉桥与箱梁式普通桥相结合混合型桥梁,桥拱跨度(单孔)大于150m,因河面宽阔,很容易遭受雷击。该工程主要考虑了防直击雷、等电位联接和防止雷电波侵入大桥照明设施的措施。利用大桥本身顶端的金属构件作为防直击雷的接闪器,把大桥钢筋混凝土构件联结成一个整体,进行等电位处理,对电源电缆进行铠装埋地、安装避雷器等措施,以实现对大桥整体进行综合性的雷电防护。

LIGHTNING PROTECTION DESIGN AND CONSTRUCTION OF JI'AN BRIDGE

The Ji’an bridge crossing the Ganjiang River is a mixed arch bridge combined with steel strand ropes and ordinary box-girder bridge. The span of each arch of the bridge is above and beyond 150m, which is vulnerable to lightning strikes. This project takes account of measures such as protecting the bridge against thunderstorm, equipotential connection and guarding lighting against the invasion of lightning wave. To achieve comprehensive lightning protection of the overall bridge, the metal construction on the top of the bridge is used as arrester, the reinforced concrete constructional elements of the bridge are bound as a whole with equipotential operation, and the power cables are installed lightning arrester and armoured and buried underground.